/**
 * @author alteredq / http://alteredqualia.com/
 */

THREE.SceneUtils = {

	showHierarchy : function ( root, visible ) {

		THREE.SceneUtils.traverseHierarchy( root, function( node ) { node.visible = visible; } );

	},

	traverseHierarchy : function ( root, callback ) {

		var n, i, l = root.children.length;

		for ( i = 0; i < l; i ++ ) {

			n = root.children[ i ];

			callback( n );

			THREE.SceneUtils.traverseHierarchy( n, callback );

		}

	},

	createMultiMaterialObject : function ( geometry, materials ) {

		var i, il = materials.length,
			group = new THREE.Object3D();

		for ( i = 0; i < il; i ++ ) {

			var object = new THREE.Mesh( geometry, materials[ i ] );
			group.add( object );

		}

		return group;

	}

};